Sales tax is 7%. if c represents the retail cost of an item, which of the following expressions represent(s) the total cost of the item? (the is a multiple answer question) c - 0.07c 0.07c c + 0.07c 1.07c 0.93c

Sales tax adds to the price so the first one is wrong since it is subtracting. the second choice is calculating 7% of the retail cost. this is just the tax, not the total cost. c + 0.07c is correct because it is adding 7% to the full retail price. 1.07c is also correct because 1.07 is the same thing as 107%. the last one is wrong because it represents 93% of the retail price.